Kanjō rōdō mo, “passhibu aguresshibu” mo, dochira mo jibun no kanjō o oshikoroshiteiru no ga gen'in. Sōshite tamekonda sutoresu ni yotte, kore made tanoshikatta koto ga tsumaranakunattari, kōfukukan o kanjinakunattari shimasu.Both emotional labor and “passive aggression” are caused by stifling emotions. Then because of the stress that builds up, previously pleasurable activities become boring and one becomes incapable of experiencing happiness.